The following document provides information on the procedure to measure the pH of aqueous wastes and those multiphase wastes where the aqueous phase constitutes at least 20% of the total volume of the waste.

This method is an SW-846 Method-Defined Parameter (MDP), meaning that it may not be modified when used for Resource Conservation and Recovery Act (RCRA) testing. For more information, see the Methods Innovation Rule page.

• Method 9040C: pH Electrometric Measurement, part of Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (PDF)(5 pp, 23 K, November 2004)